The purpose of this study was to see how coronary magnetic resonance angiography (CMRA) compared to echocardiography for the detection of coronary artery origins and to compare CMRA measurements for coronary dimensions in children with published echocardiographic reference values Any child undergoing a clinical cardiovascular MRI under general anesthesia was included in this study... Enrolled patients underwent dual phase CMRA and echocardiography under the same anesthetic... Echocardiographic measurements of the right coronary artery (RCA), left anterior descending (LAD) and left main (LM) were made from inner edge to inner edge, excluding points of branching... Six children had abnormal coronary origins... Five were identified by CMRA and the remaining one was classified as unsure (3/12 age)... CMRA performed better than echocardiography in terms of distal visualization of the coronary tree (median 1 LAD branch (IQR 0-2) vs. 0 (IQR 0-1); p = 0.001 by Wilcoxon-Signed-Ranks test)... CMRA measurements did vary according to cardiac phase... A repeated measures model demonstrates that the systolic coronary dimension (estimated marginal mean 1.90 ± 0.05 mm) is greater than the diastolic measurement (estimated marginal mean 1.84 ± 0.05 mm (p = 0.002)... Dual-phase CMRA has an excellent (94%) success rate for the detection of coronary origins in children... CMRA measurements have a systematic bias when compared to echocardiographic measurements... Future coronary reference values should quote the systolic diameter... Newborn infants remain challenging and echocardiography remains the modality of choice for this age group.

The purpose of this study was to see how coronary magnetic resonance angiography (CMRA) compared to echocardiography for the detection of coronary artery origins and to compare CMRA measurements for coronary dimensions in children with published echocardiographic reference values Any child undergoing a clinical cardiovascular MRI under general anesthesia was included in this study... Enrolled patients underwent dual phase CMRA and echocardiography under the same anesthetic... Echocardiographic measurements of the right coronary artery (RCA), left anterior descending (LAD) and left main (LM) were made from inner edge to inner edge, excluding points of branching... Six children had abnormal coronary origins... Five were identified by CMRA and the remaining one was classified as unsure (3/12 age)... CMRA performed better than echocardiography in terms of distal visualization of the coronary tree (median 1 LAD branch (IQR 0-2) vs. 0 (IQR 0-1); p = 0.001 by Wilcoxon-Signed-Ranks test)... CMRA measurements did vary according to cardiac phase... A repeated measures model demonstrates that the systolic coronary dimension (estimated marginal mean 1.90 ± 0.05 mm) is greater than the diastolic measurement (estimated marginal mean 1.84 ± 0.05 mm (p = 0.002)... Dual-phase CMRA has an excellent (94%) success rate for the detection of coronary origins in children... CMRA measurements have a systematic bias when compared to echocardiographic measurements... Future coronary reference values should quote the systolic diameter... Newborn infants remain challenging and echocardiography remains the modality of choice for this age group.